This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | -674 |
| 3 | -100520 |
| 4 | 133516 |
| 5 | 589971088 |
| 6 | 15545858824 |
| 7 | -4725783030752 |
| 8 | -290982960018800 |
| 9 | 46974010390164928 |
| 10 | 5133550692291311584 |
| 11 | -541141652104447925888 |
| 12 | -97483852261892597109056 |
| 13 | 6738266481886428192282880 |
| 14 | 2036380397264732274988968064 |
| 15 | -80522844304853268561187040768 |